Enable Prometheus historic data ingestion with out-of-order support

This commit configures Prometheus to accept historic data via the Remote
Write API, enabling backfilling of test metrics for development and
troubleshooting purposes.

Changes:
- Enable Remote Write receiver (--web.enable-remote-write-receiver)
- Enable out-of-order ingestion with 30-day window (720h)
- Enable exemplar-storage and otlp-write-receiver features
- Add Epimetheus dashboard ConfigMap for Grafana provisioning
- Remove old prometheus-pusher directory (moved to separate repo)
- Document configuration, use cases, and performance considerations

Configuration allows backfilling data up to 30 days in the past, supporting
tools like Epimetheus for generating synthetic historic metrics.

Performance note: This is optimized for ad-hoc troubleshooting, not
production use. Out-of-order ingestion increases memory usage, TSDB overhead,
and may impact query performance.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 0 insertions, 62 deletions

diff --git a/f3s/prometheus-pusher/internal/parser/json.go b/f3s/prometheus-pusher/internal/parser/json.go
deleted file mode 100644
index b6b230c..0000000
--- a/f3s/prometheus-pusher/internal/parser/json.go
+++ /dev/null
@@ -1,62 +0,0 @@
-package parser
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"io"
-	"time"
-
-	"prometheus-pusher/internal/metrics"
-)
-
-// JSONParser parses metrics from JSON format
-type JSONParser struct{}
-
-// NewJSONParser creates a new JSON parser
-func NewJSONParser() *JSONParser {
-	return &JSONParser{}
-}
-
-type jsonSample struct {
-	Metric      string            `json:"metric"`
-	Labels      map[string]string `json:"labels"`
-	Value       float64           `json:"value"`
-	TimestampMs int64             `json:"timestamp_ms,omitempty"`
-}
-
-// Parse reads metrics from JSON format
-func (p *JSONParser) Parse(ctx context.Context, reader io.Reader) ([]metrics.Sample, error) {
-	var rawSamples []jsonSample
-
-	decoder := json.NewDecoder(reader)
-	if err := decoder.Decode(&rawSamples); err != nil {
-		return nil, fmt.Errorf("failed to parse JSON: %w", err)
-	}
-
-	samples := make([]metrics.Sample, 0, len(rawSamples))
-	for _, raw := range rawSamples {
-		select {
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		default:
-		}
-
-		if raw.Metric == "" {
-			continue
-		}
-
-		timestamp := time.Now()
-		if raw.TimestampMs > 0 {
-			timestamp = time.UnixMilli(raw.TimestampMs)
-		}
-
-		if raw.Labels == nil {
-			raw.Labels = make(map[string]string)
-		}
-
-		samples = append(samples, metrics.NewSample(raw.Metric, raw.Labels, raw.Value, timestamp))
-	}
-
-	return samples, nil
-}